Avoids a System.InvalidCastException error to be thrown when passin…

…g `ObjectCollection` to `AddRangeInternal` of the `DataGridViewComboBoxCell.ObjectCollection` class

Fixes #12612

## Proposed changes

- Avoids a `System.InvalidCastException` error to be thrown when passing
`ObjectCollection` to `AddRangeInternal` of the
`DataGridViewComboBoxCell.ObjectCollection` class, by:
  - Modifying the `AddRange(ObjectCollection value)` method
  - Adding the `AddRangeInternal(ObjectCollection items)` methods
- Adds unit test

## Customer Impact

- Avoids a possible `System.InvalidCastException`

## Regression?

- No

## Risk

- Minimal

## Screenshots

### Before

![Captura de tela 2024-12-09
200542](https://github.com/user-attachments/assets/c5b9fa72-cb93-4c67-b17e-9ffb88a3fa0d)

### After

![image](https://github.com/user-attachments/assets/bc52a015-79f0-40e3-b4e5-0b2b3d095893)

## Test methodology

- Unit tests

## Accessibility testing

## Test environment(s)

- `10.0.100-alpha.1.24573.1`

 ###### Microsoft Reviewers: [Open in
CodeFlow](https://microsoft.github.io/open-pr/?codeflow=https://github.com/dotnet/winforms/pull/12613)

src/System.Windows.Forms/src/System/Windows/Forms/Controls/DataGridView/DataGridViewComboBoxCell.ObjectCollection.cs

@@ -93,7 +93,7 @@ public void AddRange(params object[] items)
         public void AddRange(ObjectCollection value)
         {
             _owner.CheckNoDataSource();
-            AddRangeInternal((ICollection<object>)value);
+            AddRangeInternal(value);
             _owner.OnItemsCollectionChanged();
         }
 
@@ -120,6 +120,26 @@ internal void AddRangeInternal(ICollection<object> items)
             }
         }
 
+        internal void AddRangeInternal(ObjectCollection items)
+        {
+            ArgumentNullException.ThrowIfNull(items);
+
+            foreach (object item in items)
+            {
+                if (item is null)
+                {
+                    throw new InvalidOperationException(SR.InvalidNullItemInCollection);
+                }
+
+                InnerArray.Add(item);
+            }
+
+            if (_owner.Sorted)
+            {
+                InnerArray.Sort(Comparer);
+            }
+        }
+
         internal void SortInternal() => InnerArray.Sort(Comparer);
 
         /// <summary>

src/System.Windows.Forms/tests/UnitTests/System/Windows/Forms/DataGridViewComboBoxCell.ObjectCollectionTests.cs

@@ -0,0 +1,33 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+#nullable enable
+
+namespace System.Windows.Forms.Tests;
+
+public class DataGridViewComboBoxCell_ObjectCollectionTests : IDisposable
+{
+    private readonly DataGridViewComboBoxCell _comboBoxCell;
+    private readonly DataGridViewComboBoxCell.ObjectCollection _collection;
+
+    public void Dispose() => _comboBoxCell.Dispose();
+
+    public DataGridViewComboBoxCell_ObjectCollectionTests()
+    {
+        _comboBoxCell = new();
+        _collection = new(_comboBoxCell);
+    }
+
+    [WinFormsFact]
+    public void ObjectCollection_AddRange_AddsObjectCollectionCorrectly()
+    {
+        DataGridViewComboBoxCell.ObjectCollection items = new(_comboBoxCell) { "Item1", "Item2", "Item3" };
+
+        _collection.AddRange(items);
+
+        _collection.InnerArray.Count.Should().Be(3);
+        _collection[0].Should().Be("Item1");
+        _collection[1].Should().Be("Item2");
+        _collection[2].Should().Be("Item3");
+    }
+}